# Neutrino -- Dark Matter Scattering and Coincident Detections of UHE Neutrinos with EM Sources

## TL;DR

This paper investigates how neutrino-dark matter interactions can cause time delays that obscure correlations between ultra-high-energy neutrinos and electromagnetic sources, offering explanations for observational discrepancies and constraints on dark matter models.

## Contribution

It introduces an effective dark photon dark matter model that explains neutrino time delays and constrains neutrino-dark matter interactions based on observational data.

## Key findings

- Neutrino-dark matter scattering can cause significant time delays.
- Such interactions can explain the lack of correlated neutrino-EM detections.
- Detection of UHE neutrinos constrains dark matter-neutrino interaction models.

## Abstract

The scattering of neutrinos off dark matter can induce time delays in their propagation compared to that of photons, which would wash out correlations between ultra-high-energy neutrinos and electromagnetic observations of their sources - while preserving the observed diffuse neutrino flux. This may explain the significant discrepancy between predictions of neutrino fluxes from gamma ray bursts and the lack of neutrinos correlated with EM observations of GRBs. Conversely, the detection of an UHE neutrino in association with a source provides a strong constraint on such interactions. We consider an effective model of dark photon dark matter interacting with neutrinos which exhibits this effect.